fix(tui): copilot review on #16707 — naming, label consistency, esc priority

- Rename `removeAt` → `removeAtInPlace` and document the mutation
  contract; the old name read like a non-mutating helper.
- Hotkey table + queue header: use `Ctrl+X` / `Esc` to match the
  rest of the UI (was `⌃X` / `esc`).
- Render the queued header as a single template literal so JSX
  text-node whitespace can't sneak into the rendered line.
- Make `Esc` while editing beat the `terminal.hasSelection` clear:
  the header promises 'Esc cancel', so an active selection
  shouldn't silently consume the keystroke.

ui-tui/src/components/queuedMessages.tsx

@@ -24,8 +24,9 @@ export function QueuedMessages({ cols, queueEditIdx, queued, t }: QueuedMessages
   return (
     <Box flexDirection="column" marginTop={1}>
       <Text color={t.color.dim} dimColor>
-        queued ({queued.length})
-        {queueEditIdx !== null ? ` · editing ${queueEditIdx + 1} · ⌃X delete · esc cancel` : ''}
+        {`queued (${queued.length})${
+          queueEditIdx !== null ? ` · editing ${queueEditIdx + 1} · Ctrl+X delete · Esc cancel` : ''
+        }`}
       </Text>
 
       {q.showLead && (